The connector that is used for chip card
Technical field
The present invention relates to a kind of connector that comprises with the contacted contact pilotage of chip.
The present invention has a large amount of application in the communication equipment field by the chip card swap data.
Background technology
Electric connector allows being electrically connected between chip card and the chip-card readers.Between chip card and chip-card readers, exchange dissimilar signals by this connector.For example, connector can be used in the special product, in financial world or the consumer goods, the chip card in the portable equipment such as mobile phone.Particularly exchange electrical power signal (for example power supply) and data-signal (for example transmitting the binary signal of the information that reads or writes chip card).
Usually, the management that provides specific treatment circuit to guarantee these unlike signals for example, is checked their potential level.These treatment circuits can directly place on the connector.
United States Patent (USP) no.6,165,021 have described and this integrated circuit have been placed connector on the chip card connector.This known connector have two mutually away from isolated area:
The first area is used for connecting chip card by one group of contact pilotage,
Second area is used to hold the integrated circuit of being responsible for the electric signal that exchanges between chip card and the chip-card readers is carried out particular procedure.
The connector of this known type has certain limitation.In fact, in order to carry out specific processing, contact pilotage is connected on the integrated circuit by the connection track on the printed circuit board (PCB) (PCB) of chip-card readers.These connect tracks and have formed current return, and this current return produces interference by the inductive action of the electric signal that exchanges between chip card and the chip-card readers.Increase or connect track when longer when connecting track quantity, it is stronger that this interference also becomes.Concerning this connector, the chip card that data-signal is provided and has a high impedance is responsive especially to this interference.This connector does not fit into the standard of the chip card of new generation with 1.8V supply voltage.
In addition, two isolated areas considering this connector have caused being difficult to using this connector in the miniaturization product such such as portable phone or PDA(Personal Digital Assistant), and therefore the miniaturization of this connector is not very important.
U.S. Patent No. 5902152 has been described a kind of connector that is used for chip card.The framework that reads that this connector is useful on the parts of control chip card read-write operation and is used for chip card.This reads framework and comprises the support component that is formed by insulating material, and holds from the contact terminal of the outstanding first kind in the last plane of the support member that formed by insulating material, electrically contacts with the contact area with chip card.On the one hand, this insulated support comprises the lower surface that is carved in the lower plane, the control terminal of second type is outstanding to electrically contact with the control of the read-write operation that is used for the control chip card contact area with parts from this lower surface, on the other hand, comprise the connection leg-shape part that is used to be connected on the P.e.c..The height of leg is restriceted envelope between insulated support and printed circuit board (PCB), and control assembly is contained between the lower plane and printed circuit board (PCB) of insulated support like this.
The connector of this known type has other multiple restriction.Really, control assembly is contained in does not allow before connector is connected to plate between the lower plane of insulated support and the printed circuit board (PCB) or insert or remove control assembly from described connector afterwards.In addition, consider that described control assembly is contained between the lower plane and printed circuit board (PCB) of insulated support, thereby do not stay empty space, the miniaturization of this connector is not satisfied.
Summary of the invention
The purpose of this invention is to provide a kind of switching signal that is not subjected to and disturb also the highly connector that is used for chip card of miniaturization.
For this reason, connector according to the present invention comprises:
Upper surface and lower surface,
Contact pilotage outstanding above described upper surface, that also will contact with chip card,
Contact pilotage outstanding below described lower surface, that also will contact with plate,
Be arranged in described upper surface, and will hold the cavity of the circuit that comprises contact chip, described cavity comprise be connected to described contact pilotage and will with the contacted surface in contact of described contact chip.
The track that is connected between the contact chip of the contact pilotage of connector and circuit has the minimum length that reduces the parasitics that inductive action produced.
Before or after connector was connected to plate, the cavity in the described upper surface allowed circuit to insert from connector or extract, and this helps making and maintenance.
In addition, the size of this cavity can make holds circuit fully in connector, improves minimizing thus.
Because contact pilotage is outstanding below lower surface, has formed the space between connector and the plate.Therefore, connector can be settled on the fixing onboard existing parts easily, perhaps optional feature can be placed in this space, can use relevant mode at the lower area of connector equally, to improve minimized degree.
In improved embodiment, cavity is placed the central area that limits by contact pilotage.
This specific embodiment helps the minimizing of connection length between the contact chip of the contact pilotage of connector and circuit, has reduced the parasitics that inductive action produced.
In improved embodiment, connector according to the present invention comprises the holding device of the circuit that is used for remaining on cavity.
These holding devices guarantee that circuit is fixed in the connector reliably.
In improved embodiment, connector according to the present invention comprises the additional coupling arrangement that is used to be electrically connected contact and described surface in contact.
These additional coupling arrangements have improved electrically contacting between the surface in contact of the contact chip of circuit and connector.
In improved embodiment, connector according to the present invention comprises that has a circuit that is connected electrically in the decoupling capacitor between electrical ground and the contact chip.
Consider that these decoupling capacitors approach the contact pilotage of connector most when this circuit is inserted into connector, so this decoupling capacitor and this circuit are integrated further to reduce interference phenomenon possible on the surface in contact of connector and noise.
The invention still further relates to a kind of chip-card readers, mobile telephone equipment and personal digital assistant that comprises above-mentioned connector.
Description of drawings
According to the non-limiting embodiment that gives an example described below, will embody and illustrate these and other aspect of the present invention.In the accompanying drawings:
Fig. 1 has described according to connector of the present invention,
Fig. 2 has described and will insert according to the circuit in the connector of the present invention,
Fig. 3 has described the connector that comprises an insertion circuit according to of the present invention.
Embodiment
Fig. 1 has described according to connector C of the present invention.View 1 corresponds to top view, and view 2 corresponds to along the viewgraph of cross-section of axle AA, and view 3 is the viewgraph of cross-section along axle BB.This connector C comprises:
Upper surface US and lower surface LS,
Outstanding from the top of described upper surface US and will contact contact pilotage P1-P6 with the chip card (not shown),
The contact pilotage P7-P12 outstanding, that also will contact from the below of described lower surface LS with plate BD,
Be arranged in the cavity that described upper surface will hold the IC circuit that comprises contact chip CT.This cavity comprise be electrically connected to described contact pilotage P1-P12 and will with the contacted surface in contact CS of described contact chip CT.
Each contact pilotage P1-P6 is electrically connected to surface in contact CS.Because chip card comprises 6 contacts, the connection of pin P1-P6 for example is defined as follows:
P1 is corresponding to the power end VDD (1.8V or 3.6V) of chip card,
P2 holds corresponding to the RESET that is used for reset to zero,
P3 is corresponding to the clock end CLK that is the data rate timing,
P4 is corresponding to the I/O end I/O of the data of chip card
P5 does not use
P6 is corresponding to the earth terminal GND of conduct with reference to current potential.
Cavity preferably is positioned at the central area that is limited by contact pilotage.In Fig. 1, cavity is delimited by periphery P ER.For example, cavity can be designed to hold the integrated circuit that is called MLF (MicroLead Frame) version.
Contact pilotage P7-P12 will transmit the circuit signal of input and/or output, and need not to contact with chip card.Each contact pilotage P7-P12 is electrically connected to surface in contact CS.
Contact pilotage P7-P12 will weld or be connected on the plate BD of application (not shown) of chip-card readers effect, as PCB.These contact pilotages P7-P12 allows to set up a space E S between lower surface LS and plate BD, and can this connector C be placed on the existing onboard parts (not shown), maybe the optional feature (not shown) can be placed this space E S.
Fig. 2 has described the IC circuit that will be inserted into according among the connector C of the present invention.This IC circuit is the integrated circuit that comprises a plurality of contact chip CT.Advantageously, this circuit is a little and thin integrated circuit, and MLF (MicroLead Frame) version for example is because this form helps minimizing of connector.
This IC circuit is responsible for the management (for example being in charge of the conversion of supply voltage of short-circuit detecting, chip card and adjusting, reset to zero, exchanges data) of the electrical interface of chip card especially.
Because produce an output voltage by pin P1-P6 to chip card, this circuit can advantageously comprise a voltage up-converter, this voltage up-converter is used to improve the input voltage of the periodic signal that offers one of pin P7-P12.This transducer can be corresponding to a charge pump voltage doubler.
Advantageously, IC circuit comprises the decoupling capacitor (not shown) that is used to weaken the high frequency parasitic elements between earth terminal GND and contact chip CT.This circuit is placed position near the contact pilotage of connector, and the effect of decoupling capacitor can be better.
Fig. 3 has described the connector C that has inserted IC circuit according to of the present invention.View 1 corresponds to top view, and view 2 corresponds to along the viewgraph of cross-section of axle CC.
As mentioned above, the contact chip CT of IC circuit is electrically connected with surface in contact CS by guarantee suitable additional coupling arrangement that electrically contacts or direct (not shown) such as spring SP.
This connector advantageously comprises the holding device M1-M4 that is used for integrated circuit (IC) is remained on cavity.These holding devices can for example be the flexible sheets of mounting spring, and described flexible sheets is left from initial position when inserting integrated circuit (IC), and turn back to described initial position when integrated circuit arrives the bottom of cavity, on the outside surface that leans against integrated circuit.Certainly, also can consider a spot of holding device (not shown).
Can in distinct device, use according to connector of the present invention, for example be used for professional use equipment (as the bank card reader), be used for the chip-card readers of mobile phone or personal digital assistant (as PDA, the electronics diary).When the user was inserted into one of these equipment with chip card, connector according to the present invention allowed described chip card to be connected with this equipment.
Invention has been described based on being used for chip card and having the connector of 6 contact pilotages.Yet the present invention also can be used to have the connector of the chip card of varying number contact pilotage, and as abideing by the chip card with 8 contact pilotages of ISO7816 standard, this chip card is the special case that the GSM type is used.Similarly, do not depart from the scope of the present invention, the contact pilotage quantity that contacts with plate can be different.